Extracted from Pike v7.8 release 866 at 2016-11-06.
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Crypto
Crypto.Substitution

Methods
 decrypt()
 encrypt()
 filter()
 set_ACA_K1_key()
 set_ACA_K2_key()
 set_ACA_K3_key()
 set_ACA_K4_key()
 set_key()
 set_null_chars()
 set_rot_key()
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Method Crypto.Substitution()->set_ACA_K1_key()

Method set_ACA_K1_key

this_program set_ACA_K1_key(string key, void|int offset, void|array(string) alphabet)

Description

Sets the key according to ACA K1 key generation. The plaintext alphabet is prepended with a keyword key that shifts the alphabet positions compared to the cryptogram alphabet. The plaintext alphabet is then reduced with the characters in the keyword. It is also optionally rotated offset number of steps.