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First failed attempt at round2 attack

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This commit is contained in:
Manuel Vögele
2019-05-15 09:26:58 +02:00
parent d03fe358e7
commit da749e84f4
2 changed files with 84 additions and 19 deletions
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53
break_script/break_aes.jl
View File

@@ -1,7 +1,7 @@
#!/usr/bin/env julia #!/usr/bin/env julia
include("util.jl") include("util.jl")
#include("sbox.jl") include("sbox.jl")
include("plotutils.jl") include("plotutils.jl")
import CSV import CSV
@@ -14,7 +14,7 @@ function parse_csv(filename)
return plaintexts, timings return plaintexts, timings
end end
function break_aes() function break_encryption()
plaintexts, timings = parse_csv("timing.csv") plaintexts, timings = parse_csv("timing.csv")
t_values = Vector{Float64}(undef, 0x100) t_values = Vector{Float64}(undef, 0x100)
for keybyte=1:16 for keybyte=1:16
@@ -30,4 +30,51 @@ function break_aes()
plot_discrete_tval(0:0xFF, t_values, "key") plot_discrete_tval(0:0xFF, t_values, "key")
end end
break_aes() function roundkey_g(last, round)
rc = [0b00000001, 0b00000010, 0b00000100, 0b00001000, 0b00010000, 0b00100000, 0b01000000, 0b10000000, 0x1b, 0x1b << 1]
next = Vector{UInt8}(undef, 4)
next[4] = sbox[last[1] + 1]
next[1] = sbox[last[2] + 1] ⊻ rc[round]
next[2:3] = sbox[last[3:4] .+ 1]
return next
end
function build_key_schedule(initial_key)
round_keys = Matrix{UInt8}(undef, 11, 16)
round_keys[1, :] = initial_key
for r=2:11
round_keys[r, 1:4] = round_keys[r - 1, 1:4] .⊻ roundkey_g(round_keys[r - 1, 13:16], r - 1)
round_keys[r, 5:8] = round_keys[r, 1:4] .⊻ round_keys[r - 1, 5:8]
round_keys[r, 9:12] = round_keys[r, 5:8] .⊻ round_keys[r - 1, 9:12]
round_keys[r, 13:16] = round_keys[r, 9:12] .⊻ round_keys[r - 1, 13:16]
end
return round_keys
end
function break_decryption()
keys, timings = parse_csv("timing.csv")
round_keys = Array{UInt8, 3}(undef,11, size(keys, 1), 16)
for keyno=1:size(keys, 1)
round_keys[:, keyno, :] = build_key_schedule(keys[keyno, :])
end
t_values = Vector{Float64}(undef, 0x100)
r_shiftrows=[0, 13, 10, 7, 4, 1, 14, 11, 8, 5, 2, 15, 12, 9, 6, 3] .+ 1
for secretbyte=1:16
for secret=0:0xFF
# TODO Shift rows must be respected here
msbs_set = ((round_keys[10, :, r_shiftrows[secretbyte]] .⊻ r_sbox[(secret .⊻ round_keys[11, :, secretbyte]) .+ 1]) .& 0xE0) .!= 0
#msbs_set = (sbox[(keys[:, secretbyte] .⊻ secret) .+ 1] .& 0x08) .!= 0
group_slow = timings[msbs_set]
group_fast = timings[msbs_set.==false]
t_values[secret + 1] = t_val(group_fast, group_slow)
end
print(format("{:02x} ", argmax(t_values) - 1))
if secretbyte==1
plt = plot_discrete_tval(0:0xFF, t_values, "secret data")
display(plt)
end
end
println()
end
break_decryption()

18
break_script/sbox.jl
View File

@@ -17,3 +17,21 @@ const sbox = [
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 ]; 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 ];
const r_sbox = [
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d ];